冷成型10CrNi5MoV钢拉伸性能恢复热处理工艺研究

Research on Heat Treatment Process for Tensile Property Recovery of Cold-Forming 10CrNi5MoV Steel

采用不同的热处理工艺参数对冷成型10CrNi5MoV钢进行性能恢复热处理试验,并对比热处理前后拉伸性能及显微组织变化情况。结果表明,由于包申格效应,冷成型10CrNi5MoV钢的拉伸性能发生了显著的变化,受压侧拉伸屈服强度降低,受拉侧拉伸屈服强度上升;冷成型10CrNi5MoV钢在250℃~620℃温度范围内进行性能恢复热处理时,加热温度对钢板拉伸性能恢复程度影响显著,而保温时间和升温速率则对其影响不明显;性能恢复热处理后的冷成型10CrNi5MoV钢金相组织及晶粒度未发生明显变化,而位错密度减小。

Different heat treatment parameters are used in the performance recovery of 10CrNi5MoV steel.The changes of tensile properties and microstructures before and after the heat treatment are contrasted.The results show that the tensile properties of cold-forming 10CrNi5MoV steel change significantly due to the Bauschinger effect.The tensile yield strength of the compression side decreases while that of the tension side increases.When cold-forming 10CrNi5MoV steel is treated at 250-620℃,the heating temperature has a significant effect on the recovery degree of the tensile properties,while the holding time and heating rate have no obvious effect.The microstructures and grain sizes before and after the heat treatment change little,and the dislocation density decrease.